Stoking mechanism.



STOKING MEGHANISM. APPLICATION.IE'ILED APR.14, 1906.

Patented July 12, 1910.

4 SHEETS-SHEET l.

QMY, A/ AMM P. L. GROWE & A. FRANKENHEIM.

STOKIN G MECHANISM. APPLICATION FILED APR. 14, 1906.

964,399. Patented July 12, 1910.

4 SHEETS-SHEET 2.

P. L. G ROWB A 1; A. PRANKBNHEIM.

STOKING MECHANISM. APPLICATION FILED A1=11.14, 1906.

Patented July 12, 1910.

4 SHEETS-SHEET 3.

Witwe/aow m m) M FFQE.

PAUL L. CRO'WE, OF JERSEY CITY, NEW JERSEY, ANI) AARON FRANKENHEIM, OF NEW YORK, N. Y.; SMD FRANKENHEIM ASSIGNOR T0 SAID CROWE.

STO'KING MECHANISM.

Specification of LettersPatent.

Patented July y12, 1910.

Application filed April 14, 1906. Serial No. 311,699.

To all whom it may concern:`

Be it known that we, PAUL L. Crown, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, and AARON FRANKEN- HEIM, a citizen of the United States, and resident ot New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Stoking Mechanisms; and We do'hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in stoking mechanism, and has for its object the provision of means for facilitating combustion in a furnace, as well as minimizing the cost ot construction.

' With this and other objects in view, the invention consists of certainnovel constructions, combinations and arrangements of parts, as will be hereinafter fully described and claimed.

In the drawings z-Figure 1 is a longitudinal, vertical, sectional view of the improved stoking mechanism. Fig. 2 is a perspective view of the movable bridge and adjacent portions of the conveyor. Fig. 3

is a view in side elevation of the mechanism constructed in accordance with the present invention, with the chain grate omitted. Fig. 4 is a front view, in elevation, with parts'broken away to show the internal construction. Fig. 5 is a perspective view .o-t theaframe of the stoking mechanism. Fig. is an inverted plan View of aplurality of the lapping bars in engagement. Fig. 7 is a `perspective view of the dumping plate. Fig. 8 is a view in side elevation of one ot the sprocket wheels. Fig. 9 is an end view of aA sprocket ivhecl. Fig. 1() is a view, in side elevation, of one of the grate bars. Fig. lliis a fragmentary View, in side elevation,

of one end of the grate bar, showing the means for fastening the bar to a vertical link. Fig. 12. is a similar view of a grate bar, showing the means of fastening the opposite end to a horizontal link. Fig. -13 is a transverse, sectional view et' a grate bar construdtcd in accordance with thc present y invention. Fig. 14 is a fragmentary, top plan view of a traveling grate pprtion, showing three of the grate ars in horizontal lower beams 1 and 2 are spaced a section, one bar through the lower strengthening web, the third bar through the side strengthening web at the root of the surface web. Fig. 15 is a' fragmentary, sectional view of the mechanism showing the rollers adapted to support the endless traveling grate portion. Fig. 16 is a perspective view of one of the lapping bars. Fig. 17 is a detail top plan View of the conveyer adjusting means. j

Referring to the drawings by numerals, 1 designates the upper, and 2 the lower channel beams of the frame of the stoking mechanism. While, of course, this frame may be made of any'structural material, we preferably use channel beams. The upper and art by channel pieces or struts 3 and rigidly held with respect ,to each other, both longitudinally and vertically. The channel struts have their flanges bolted to the adjacent each side of the traveling grate. The apertures into which the transverse shafts are inserted are preferably located above the lower ange of the'channel beam for the purpose of obtaining the iiexibility from the wrought'material of which the channels are composed and of the web of the beam up t its upper surface.

On the interior of the fra-me of the grate structure are transverse shafts 4, which are provided with wheels 5, Fig. 1, so formed upon their periphery as to receive the horizontal and vertical links of the chains 6, Fig. 14. When the vertical links of said chains pass over said wheels 5, the grate surface will rise at that point,and when the horizontall links ass over said wheels, the grate surface will correspondingly drop. The passing of the links of the chains 6 over the wheels 5 causes an uneven movement of the grate surface, resulting in keeping the fuel in a loose condition, permitting the passage of air throu h the fuel with the least resistance. The ower, transverse rods 7 are xed'to the channel beams 2, the said rods carrying tubular members oi drum 8, (Fig. 15), over which the grate surface returns. 'lhcse tubes have collars inserted in their ends forming bearings. ,The rods 4 rest upon the upper surface of the lower flanges of the channel beam 1, and by porto rating the ends of said rods and flanges o l. which bridge loosel ytended beyond the lower the channel beams, securing bolts 9 may be passed through the rods and flanges for securely holding the said rods in position and also spacing the channel beams of the opposite sides of the grate frame with respect to each other. The rear end of each of the upper channel beams 1 is preferably exchannel beams 2 a sulicient distance to properly support the dumping plate 12, Figs. 1, 3 and 7.

The dumping plate 12 is formed with a blank portion extending from the supporting, enlarged portion 13, which enarged portion 13 supports a bridge 14, cosistmg of lapping bars 15, Figs. 1, 2, 3 ani-ty 7`, 16. The dumping plate is further providedwith a stationary frame 138L serving as the edge of the ash tray, the bottom Aof which c nsists of the dumping plate 12. Each lap b r 15 is provided with an engaging recess 1'y preferably circular shape and adapted to e adjustedto the enlarged portion 13 of the dumping plate 12. The recess 16 of each of the lapping bars 15 has converging extremities 17 sufficientlycontracted to allow the bar to be positioned longitudinally upon the enlarged portion 13 of the dumping lplate by means Each lapping 'bar l5 is thus pivota-lly mounted upon the enlarged portion 13 of the dumping plate and the forward, free end of the bar constitutes the bridge 14, rests upon the upper surface of the grate.

Referring particularly to Figs. 6 and 16 oppositely extending` lugs 19 are formed upon each lap bar preferably near the front end thereof. Upon each bar in directly oposite portions to the lug of the adjacent ar, are lug-receiving notches 20, Fi 6. When the bars 15 are in their assem led positions, Fig. 6, each lug 19 is normally seated in a notch, 2).l Upon vertically moving one of said bars, the adjoining or contiguous bars will be also slightly raised by means of which any small' clinker, which may adhere to the grate, may pass underneath said bridge 14 Without interfering with the operation of the mechanism, the elasticity of the brid the lap bars will drop 1n their positions autoweight of the contiguous lap bars. It will, therefore, be obvious that Iour improved bridge 14 constitutes a liexible structure.

The dumping plate 12 is operated by a rod 2.2 which rod may be pivotally connected, as at 21 with the under surface of said dumping plate 12 said'rod extending forwardly the front of the furnace, Fig. 3. By moving the rod 22 forwardly, thedlnnping plate 12 may be swung downwardly, as 1t is hinged upon trunnions 23, which trunnions are placed eccentrically with respect to the enlarged portion 13. Any accumulation of notches 18, Fig. 7.`

- limited ge 14 being-'such thatl y ed` and the matically of their own weight and by the the enlarged portion 13 of the dumpingI plate occasioned by the operation of the rod.'

22 will be communicated to the lapping bars 14, giving slight vertical or horizontal movement, but'since the said lap bridge rests loosely upon the grate surface, the movement thereof will not affect the operation of the Stoker parts in any way,l but tend to keep the lap bars free from each other. `The lap bars are placed onthe dumping plate frame for simplification and particularly for moving the lap bars every time' the dumping plate is operated to dump the ashes, thus preventing them from being burned together, which occurs gradually when the lap bars remain without motion for a definite period. Of course, theinward thrust ofthe rod 22 operates to restore the dumping plate 12 toits normal position for collecting ashes at the rear endof the grate, preventing the inflow of air.

bridge 14 in a comparatively clean condition, as ashes and clinkers will be passed upon the bridge andvsubsequently deposited upon the dumpingI `plate 12. The bars of the bridge being slightly separated allow a quantity of air to pass through, sufficient to consume any possibly unconsumed fuel that may pass over them thereby thoroughly consuming the same, before reaching the dump plate 12. The front wall oflthe stoker is protected by the front, plate 61 forming the' rear wall of the ho per.

Referring to Figs. 3 `and 4, a opper 24 is closed by a removable plate, which plate is held in position by springs 25', arranged at each end of the hopper near the upper edge thereof. These `sprin s 25 engage apertures formed in the en -walls of the are entto form catches arranged to spring into the apertures' in the end wall of the hopper 24 automatically andmay be retractplate lifted out of position, when it is desired lto remove the same, the lower end of springs bein rigidly attached to said plate. Any desire mechanism may be employed for operating the .shaft 26 carrying the endless chains 6 to which are secured the grate bars 27, Fig. 14.

being received from the hopper 24 and as it passes rearwardly into the combustion chamber of the furnace, it becomes gradually coked and ignited. By the time theA material upon theV traveling grate" surface reaches bridge 14, it will .usually be reduced to ashes and clinkers and will The grate hereinafter clescribed, will be permitted to pass under the v The grate is, ofV course, moved comparatively slowly, the fuel be forced fromV hopperl 24. The upper ends of the'springs v 964,399 lil.

said grate over the bridge and deposited on the dumping late 12, as heretofore stated. The iianges of) each of the channel beams 1 terminate short of the front Vendfor securing the hopper 24 to the frame, s ee Fig. 1. The rear end of the frame ofthe mechanism may besupported in any suitable manner, but in the present embodiment it is preferable to'pivotally support the rear end of said frame, permittino thevraisngvand low-V ering of the front end of the Stoker. This pivotal movement is permitted upon the standards 28 by means of the shaft 29 being supported upon brackets` or bearings 30 carried by standards 28, the channel beams resting upon shaft 29. This construction permits the regulation of the grate by screw`31. The forward end of the-'channel irons rest upon the shaft 26.supported by standards 32, said shaft also carrying sprocket wheels 42 upon which the endless chain 6 isV supported.

. The traveling grate bars 27 are carried by the chain. The screws 31 are threaded into standards 32. The ends of the standards are positioned within notches or recesses 32a.

By rotating the screws 33, the standards 32 may be -mo'ved outwardly for' tightening the endless traveling grate surfacel composed of` the endless chain 6 and the ate bars 27. 1f the standards 32 are permitted to swing outwardly,`theendless traveling rate will be stretched or tightened `principally by the weight of the front of vthe Stoker, while, if said standards 32 are moved inwardly the endless traveling portion will be slackened.

Cooling means for the front portion of the stoker is depicted in Fig. 4, which means comprises an outer pipe 36and an inner pipe 37. The outer pipe 36 is positioned between the front arch and the front wall of the stoker constituting the rear wall of the hopiper 24. The auxiliary or' smaller pipe 37 extends substantially t e entire length of the horizontal portion of pipe 36, excepting at thev extreme end where circulation is permitted from one. pipe to the other, which is ypositioned contiguous to said front wall, said v auxiliary pipe 37 being open at its extremity, so that the coollng agent may pass through said is discharged from pipe 36 through a downwardly extending portion 38, or v1ce versa.

Referring to Fig. 4,' it isto be noted that the frame pieces'of the hopper 24`are proat their lower edges on shaft 26. The ad? justment of screw 31 therefore effects the adjustment of the grate and of the hopper resting on sha-ft 26.

ipe for causing the c1rcul a, tion of the coo ing agent. The heated liquid grate bar is-provided with the ordinary ingers or teeth upon each side. Each bar isse;

.cured to the links of the chain 6 by means of horizontal and vertical shoes^47 and 48, respectivelv. The horizontal shoe 47 of each bar is first placed on the web of the 'bar and then 80 hooked into a Vertical link of one of the chains and subsequently the opposite end of the bar is positioned between the sections of the vertical shoe 48 and then txedly secured thereto by aspring cotter or other securing means. The dependin web is tapered in width from the ends o the bar toward the central portion which is deeper and thinner as indicated at46,` whereby the `heavier or stronger portion of the"'bar' is at the ends 90 thereof shown at49 close tothe chain shoes enabling the bars to withstand all torsional strains occasioned by performing their functions in the operation of the Stoker. The Web 50 takes up the side strains in thus per- 95 forming said work.

The upper 'extremityof the standard 32 is provided with a recess vor aperture51 roport-ioned to receive a nut 52 and provided Y upon opposite vsides with recesses l53 posi-.100

tioned and proportioned toreceive and accommodate the screw 33, whereby the nut 52 is maintained against rotary displacement and the screw 33 is positioned for enga ement with the frame of the hopper, as here- 10 5 inbefore described.

From the above description, it will be levident that our stoker mechanism is admirably adapted for accomplishing the ob-l I jects set forth at the beginning of the speei- -lication and in a manner well suited for handling fuel in furnaces.

What we'claim is 1. In a stoking mechanism'of the character described, a travelingv grate, a bridge resting at one end on the traveling grate, a dumping plate arrangedv in4 a horizontal plane when closed and located adjacent to and extend-ing beyond 'the other Vend of said bridge, means connecting said bridge and dumping plate for moving the former as the dumping plate is lowered and raised, and a dumping plate frame positioned above the dumping plate.

2. In a stoking mechanism of the character described, a traveling grate, a bridge resting at one end on the traveling grate, a dumping plate arranged in a horizontal plane when closed and adjacent to and eX- tending beyond said bridge, said plate bcgrate and its other end connected to the eccentric hinge.

4. In a stoking mechanism of the charac- .ter described, an endless traveling grate, a

dumping plate arranged in a' horizontal plane when closed located adjacent to one end of said traveling grate and provided with an eccentric. hinged portion, channel side plates formed with outwardly turned flanges sup orting said dumping plate, saiddumping p ate having its support 1n the web of said channel plates intermediate the ianges, a bridge located between said dumping plate and the end of the traveling grate and having one endrestingl loosely upon' the traveling'grate and its ot er end plvotally engaging said eccentric hinged portion of the dumping plate whereby one edge'o the bridge is raised and lowered by thel movement of the dumping plate.

5. In a stoking mechanism of thel characlter described, an endless traveling grate, aV dumping plate arranged in a horizontal.

` plane when closed located and hinged adjarately detachab cent to one end of said traveling grate and-- having an enlarged eccentric portion, a

bridge located between said dumping plate,`

and endless grate and having one end loosely restin on said traveling grate andi-its other end hm ed to said enlarged'eccentricportion, said bridge being com osed of sepasitely projecting side portions for .connectlng them together at their ends adjacent to the traveling grate.

6. In a stoking mechanism of the charac-V ter described, an endless traveling grate, a dumpin plate arranged in a horizontal plane w en closed located and hinged adjacent to one end of said travelin grate and vhaving its pivotal portion provi ed'with an enlarged portion eccentric thereto, a bridge located between said dumping plate and the end of'saidtraveling rate -and resting at one end upon the travellng grate and hinged at its other: end to said enlarged eccentric portion of thel dumping plate, said bridge being vcomposed of spaced bars, each of said bars being independently detachable and having a recess at one-end engagingr'said enlarged eccentric portion of thedumping plate and provided at its opposite'end with 5 a. partly oval recess, and lugs extending late bars provi ed with oppo-.

erally from each side oi said bar adjacent to said recess, said lugs of each bar extending into the recesses of the adjacent bars.

7. In a stoking mechanism of the character described, supporting channel bars having their flanges outwar ly turned, a traveling grate, a hopper located at one end'of said traveling Grate for feeding fuel thereto,-

one side of theliopper constituting the front plate of the furnace and the oppositeslde being detachable, and spring connections securedfto said detachable plate for holding the latter plate in position.

8. In a stoking mechanism of the character described, a traveling grate, a hopperlocated at one end of said travelinggrate and including a plate arranged adjacent to the wall of the arch of the furnace, and a second plate pivotally secured in position opposite the first plate, a spring connecting the second plate with the end plate for hlding thelatter in position, and Acooling means located back of the` late rst mentioned adjacent to the arch o the furnace and positioned between the front. plate of the 'hopper and the ylire box.

. 9. In a mechanismy of the class described,

in combination, a frame comprising upper and lower yieldable side supportin channel plates having outwardly directe anges and struts connecting said u perand lower channels and extendmg longltudinally with respect thereto, the said'struts serving to brace .said channel plates against longitudinal vtorsional strain and serving also to space the said channel plates.

10. In a mechanism of the class described, the combination with a frame, an endless traveling grate 'carried by said frame, a dumping p ate positioned conti uus to said endless traveling grate, said p ate comprising a `iat portion and an integral enlarged portion, trunnions secured eccentrically Ato the ends of said enlarged portions, a station- 'ary frame above one edge of the dumping plate, a bridge pivotally secured on the enlarged portion of said dumping plate and spanning the space between sald traveling said bridge consisting of lap bars, each bar comprising a body provided with a recess at one end conforming to the enlargedV portion of the dumpino'plate, and at its opposite end withl partly oval recesses on one side, and laterally partly oval lugs on the opposlte side, the saidy lugs of each bar extending intO the recesses of the adjacent bars when said lap bars are in juxtaposition.

11. In a mechanism of the class described, the combination with a frame, of a travelingvfrate mounted on said frame, a hopper for i5 hopper, spring-bolts arranged-to secure said ceding fuel to the surface of said grate,- a detachable plate forming one wall of the grate-and said plate, said bridge resting at one end loosely upon the traveling grate, andV plate in'position, said spring bolts forming catches arranged to engage portions of the hopper structure for securmg said front plate in position.

12. In a mechanism of the class described,

a frame with: outwardly turned llanges, rods arranged'in the frame and extending transversely thereof, pedlar wheels journaled on said rods, chains passing over said wheels` and pivoted in the web thereof, sai dumping plate being provided with an e larged `portion formed upon one edge, said enlarged portion provided with notches, lap bars'each provided with a circular recess, the lower portion of said recess being cut away sufliciently to4 pass through the notches of saidenlarged portion of said dumping plate a-nd permitting the upper portionlof -,said recess to be positioned thereon for loosely securing said barsupon said enlarged portion4 of said dumping plate and positioning them contiguously to span the distance betweensaid dumping plate and said endless grate.

14. In a mechanism of the character de-v scribed, the combination with a grate frame, a grate carried by said frame, anda dumping plate arranged in a horizontal plane when closed, of abridge spanning the space between said dumping plate and said grate, said bridge comprising lapping bars each bar provided with oppositely extending project1ons and with recesses contiguous to said projections, the oppositely extending projections upon each bar engaging the recesses of the adjoining bars,'the dumping plate being provided with means whereby said bridge will be moved when saiddumping 4plate-is lowered.

15.' In a mechanism of the class described, the combination with supports,of rods carried by said'supports, sprocket wheels carried by one of said rods, chains positioned u on said s rocket wheels, a lgratebai' secure to said c ains, each sprocket wheel being provided with a recessed portion in the inner face thereof, fastening means ixedly securing said grate bars to said chains, said fastening means being adapted', to enga e the recessed portions of the sprocket whee s.

V16.. -In a stoking mechanism, the combination of a traveling conveyer,of a frame for supporting 'such conveyer, a standard arranged to adjust one end of the frame vertically, and provided with an aperture in its .upper extremity, a nut dis osed within said aperture and a screw exten ing through said nut and aperture and engaging the frame, and arranged to move the upperextremit of the standard angularly.w

17. n a mechanism of the class described, the combination of a frame comprising yielding channel side supports, each support comprising a web, and flanges on the web, rods extending through the webs of the channels and secured to the flanges, and a fuel supporting traveling grate supported by the rods.

18. In a mechanism ofthe class described, a frame of yielding channel irons, each comprising flanges and a web said flanges bein outwardly turned and said web being forme with apertures extending therethrough, rods rovided with apertures at their ends passing through the apertures in said web, and fastening means connecting the rods with each flange of the channel irdns.

19. In a mechanism of the class described, a yielding channel iron frame, chains mountedto move around said frame and comprising alternate vertical and horizontal links, the lVertical linksof the chain on one side of the rate' being opposite the horizontal links o1 the-'chain on the other side of the grate, grate bars extending between the sides of said frame, each bar being connected at one end to a horizontal link and at theother end to a vertical link, and supporting rollers for the chains said vertical and horizoning a hinged connection withv said bridge 1'15l by means of which one edge of the bridge is raised and lowered as the dumping. plate is lowered and raised, and a dumpmg plate frame'secured stationary between said channel irons and arranged to form an. air-tight joint with said dumping plate when closed.

21. Ina stoking'mechanismof the class described, "a traveling grate, a rate frame formed of channeled side p ates, with flanges extending outwardly, a dumping plate located in the rear of said grate, comprising a flat portion and a circular enlarged portion along one edge, said enlarged portion being pivotally supported in the'web of the channeled side plates above the 130 lower flanges and at the rear end of said side plates, a dumping plate frame connected at each end to the web of said channeled side plate, and above the dumping plate a bridge comprising independent sections, one end of each section resting on the rear of the traveling grate, the dumping plate being arranged to swing adjacent to and in a normal operative position in dumping in the opposite direction vto the traveling rate and to swing to a` horizontal closed position against the under side of the dumping plate frame.

22. In a mechanism of the class described, the combination of a grate frame, a traveling grate mounted inl said frame a vertically adjustable lfuel hopper and a detachable closure plate therefor, spring bolts arranged to secure said plate in position, such bolts forming handles for such closure plate, cool- -nlg means positioned back of the front plate contiguous to the arch Walls and extending parallel with said hopper, said cooling means permitting the free vertical adjustment of the traveling grate to the front plate, the cooling means so arranged as shown, for 'the protection of the said front plate from the furnace heat and the free expansion of said cooling means.

23. In a mechanism of the class described, a traveling grate frame formed of channel plates with ianges extending outward from the grate surface,'rods extending between said frames and fixed between the fianges of the channel plates, collars mountedrotatably upon the rods and cylindrical rollers mounted pivotally on the rollers and rotatin therewith 1n combination with w trave ing grate surface, a dumping plate, a lap bar bridge `formed in sections and mounted pivotally on the dumping plate co-acting with said grate surface, and having interlocking devices for receiving the ashes from the traveling grate.

24.-. In a mechanism of the class described, a yieldable frame for a traveling grate comprising side supporting channel'plates having outwardly directed flanges and struts of like material connecting the upper and lower channels and extending longitudinally therewith, the said struts servlng to brace said channel plates against the longitudinal torsional strains, in combination with a pivotal support at the rear end of said frame, and means for adjusting the front of the frame.

25. In a mechanism of the class described,

a frame, chains mounted to move around the said frame upon rollers and comprising alternate Vertical and horizontal links and grate bars extending between the frame and alternately connected with horizontal andvertical links and means adapted to produce in combination with vertical and horizontal links an undulatory movement of the grate bars.

In testimony whereof We atlix our signatu res.

PAUL L. CRCI/VE'. AARON FRANKENHEIM.

In the presence of-' ALBERT F AHNER,

HERMAN L. SCHMEDES. 

